Display screen or portion thereof with a graphical user interface



The FIGURE is a front elevation view of a gaming services robot including a display screen or portion thereof with a graphical user interface showing the new design.

The pseudo-rectangular broken line illustrates a display screen or portion thereof and forms no part of the claimed design. Broken lines within the pseudo-rectangular broken line represent elements of the display screen or portion thereof with a graphical user interface that form no part of the claimed design. The remaining broken lines represent environmental features of a gaming services robot that includes the display screen or portion thereof with a graphical user interface, and form no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 